*4.4. Connection Harmonization Time*

The time for the harmonization of the equipment connection *t*harmonize depends on the applied communication tools, the time for preparing the equipment to be connected and its documentation, the time for equipment connection, and the time needed to ensure that the connection was successful.

The dispatcher must check the possibility of switching on a power line [38]:


After that, the command to turn on the equipment is given. In total, the time of connection harmonization can take up to 20 min.

## *4.5. Analysis Results*

Considering the values of time intervals, the PS restoration time was calculated using Equation (1):

$$t\_{\text{restor.}} = 1.01 + 2.94 + 1.00 + 0.33 = 5.28 \text{ h}$$

The indicated time of power supply restoration based on our analysis is equal to 5.28 h. This duration is significant and can cause considerable material damage to consumers supplied from the electric grid where blackout has occurred especially for those sensitive to process shutdown.
